Brewer's yeast

Saccharomyces cerevisiae, also called brewer's yeast or baker's yeast, is a species of yeast. The species has been instrumental in winemaking, baking, and brewing since ancient times. It is believed to have been originally isolated from the skin of grapes.

It is one of the most intensively studied eukaryotic model organisms in molecular and cell biology, much like Escherichia coli as the model bacterium.
It is the microorganism which causes many common types of fermentation.
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Source: Wikipedia · Image: Wikimedia Commons · CC BY 3.0

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